Macro for set intersection

Question

I want to create a macro for intersections that can switch between cap and bigcap depending on the situation. Here is what I came up with based on browsing other posts on the forum. Are there any hazards to this approach? Is there a better way?

\documentclass{article}

\makeatletter
\newcommand{\intersect}{\@ifnextchar_{\bigcap}{\cap}}
\makeatother

\begin{document}

\[
    A \cap B
\]
\[
    A \intersect B
\]
\[
    \bigcap_{i=1}^{n} A_{i}
\]
\[
    \intersect_{i=1}^{n} A_{i}
\]

\end{document}

Answer 1

Technically that is probably as good as anything if you want a switch, but actually I wouldn't do it.

It effectively means the infix command is \intersect and the prefix command is \intersect_ both of these are longer than the standard \cap and \bigcap and unless you define lots of other similar commands makes the command inconsistent with the rest of latex which uses different commands eg + and \sum.